CA/4/09, Swine Flu Virus, TEM

( )ssrna virus a/california/4/2009 ca/4/09 h1n1 histopathology human infectious disease influenza a virus influenza a microbiology micrograph microorganism negative sense orthomyxoviridae pathogen rna virus segmented single stranded siv s oiv swine flu virus swine flu swine influenza virus swine strain swine origin influenza virus tem virus